An invoice calculator adds up your line items, applies an optional discount and tax rate, and shows the subtotal, tax, total, and balance due after any deposit. Enter your line items below to calculate an invoice total, then review the result before creating the matching invoice.
line amount = quantity × rate subtotal = sum of line amounts discount amount = subtotal × discount rate (percentage) or the fixed amount you enter tax = tax rate × (subtotal − discount) total = subtotal − discount + tax
This matches the InvoiceCraftly editor's own arithmetic: a whole-invoice discount lowers the taxable amount, so tax is calculated on the discounted subtotal. When lines carry different tax rates, the discount is shared across them in proportion to each rate's share of the subtotal. Balance due, if you enter a deposit or payment already received, is total − deposit.
Worked example
37 hours at €85, 10% discount, 25% VAT
Subtotal: 37 × €85.00 = €3,145.00. A 10% discount is €314.50, leaving a taxable amount of €2,830.50. Tax at 25% on that discounted amount is €707.63. The invoice total is €3,145.00 − €314.50 + €707.63 = €3,538.13. A 30% deposit of €1,061.44 leaves a balance due of €2,476.69.
What this means on an invoice
Line items, currency, and discount can carry into the editor
Each line item becomes an invoice line with the same description, quantity, unit, rate, and tax rate. A whole-invoice discount carries the same way, matching the InvoiceCraftly editor's discount field. Deposit and balance due are shown here for planning only — InvoiceCraftly records an actual payment received against the invoice you create, not from this calculator.
Common mistakes
Check these before sending
A whole-invoice discount reduces the taxable amount, here and in the InvoiceCraftly editor. Discounts that depend on later conditions, such as an early-payment discount the client may or may not take, follow local rules — check those before sending.
A calculated deposit is not the same as a recorded payment — record the actual amount received on the invoice itself.
Enter the tax rate that actually applies; this tool does not determine VAT or sales-tax treatment for you.
Check decimal quantities (for example, 7.5 hours) use the separator your browser expects.
Invoice calculator FAQ
How do I calculate an invoice total?
Add up each line item's quantity × rate for the subtotal, subtract any whole-invoice discount, calculate tax on the discounted amount, and the result is the invoice total: subtotal − discount + tax.
What is 37 hours at €85 per hour?
37 × €85.00 = €3,145.00 before any discount or tax.
What is €4,000 plus 25% VAT?
25% of €4,000 is €1,000, so the total is €5,000.
What is the balance after a 30% deposit?
Balance due is the invoice total minus the deposit amount. A 30% deposit on a €3,538.13 total is €1,061.44, leaving €2,476.69.
How does a discount affect an invoice total?
A whole-invoice discount reduces the taxable amount, so the tax shrinks with it: the discount is subtracted from the subtotal first, and tax is calculated on what remains.
What is the difference between invoice total and balance due?
Invoice total is subtotal minus discount plus tax. Balance due is the invoice total minus any deposit or payment already received.
Can I turn an invoice calculation into an invoice?
Yes. After you calculate a result, choose "Create this exact invoice" to review the line items, currency, and discount in the InvoiceCraftly editor before anything is added.
Does this create an invoice automatically?
No. The button opens a review step in the editor. Nothing changes until you confirm it there.
